Early warning method of stable-state index of power quality

Abstract

The invention discloses an early warning method of stable-state index of power quality. The method is realized by support from a power quality online monitoring device and a computer. The method is characterized by comprising the following steps of: (1) selecting power quality indexes in advance, including voltage deviation, voltage total harmonic wave, short time flicking, etc, and setting earlywarning threshold values at four grades; (2) acquiring power quality data in real time, and analyzing each power quality index to carry out early warning grading; and (3) saving the values calculatedand a final early warning grade into a database. The early warning method of stable-state index of power quality establishes an early warning structure with two types, including index standard-exceeding type and index abnormal type, and four grades, and adopts time sequence mining algorithm based on high-order statistics in abnormal mining link to analyze potential abnormity of power quality datawith skewness and peakedness. Practice proves that the early warning method is clear in hierarchy, high in algorithm efficiency, strong in accuracy and good in operability. The early warning method is high-efficient and comprehensive.

Description

technical field [0001] The invention relates to a power quality monitoring technology, in particular to a power quality monitoring technology for power systems and power user distribution networks. Background technique [0002] Power quality can be simply defined as: the voltage, current or frequency deviation that causes user equipment to malfunction or not work properly. From this definition alone, we can see the importance of power quality. [0003] With the rapid development of national electrified railways, the grid-connection of large-scale wind power generation, and the wide application of new power electronic equipment, the power quality problems caused by this are becoming more and more serious; and with the construction of smart grids and micro-grids, Power quality, as an important part, will definitely get more attention. For this reason, many provinces across the country are stepping up the construction of corresponding power quality monitoring platforms to ful...

AI Technical Summary

Problems solved by technology

[0005] If the warning line of the power quality index is set too high, it will easily lead to the untimely warning, causing the system to fail to detect some abnormalities in time, causing accidents, or causing some minor abnormal data information to be lost; setting the warning line too low will easily cause system failure. Frequent warnings cause unnecessary waste of manpower

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